<template>
  <div>
     <!-- 面包屑 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert
        title="添加商品信息"
        type="warning"
        center
        :closable="false"
        show-icon>
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeName-0" finish-status="success" align-center >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏 -->
      <el-form class="demo-ruleForm"
        label-position="top"
        label-width="100px" 
        :model="addForm" 
        :rules="addrules" 
        ref="addruleForm" >
        <el-tabs :tab-position="'left'" 
            v-model="activeName" 
            @tab-click="tabClicked"
            :before-leave="beforTablLeave">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input type="number" v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input type="number" v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input type="number" v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <!-- 分类 -->
            <el-form-item label="商品分类" prop="goods_cate">
              <el-cascader
                style="width: 18%;"
                clearable
                v-model="addForm.goods_cat"
                :options="CateList"
                :props="{ expandTrigger: 'hover' ,label: 'cat_name',value:'cat_id' }"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item 项 -->
             <el-form-item 
                v-for="item in manyTabData" 
                :key="item.attr_id" 
                :label="item.attr_name">
                <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" border
                  v-for="(cb,i) in item.attr_vals" :key="i">
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!-- 商品属性 -->
            <el-form-item :label="item.attr_name" 
              v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>       
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 上传图片 -->
            <el-upload
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :headers="headerObj"
              :on-success="handleSuccess"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品描述" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce">

            </quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="PreViewVisible"
      width="50%">
      <span>
        <img :src="previewPath"  alt="" class="previewImg">
      </span>
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default{
  name:"AddGoods",
  data() {
    return {
      // 上传图片的url地址
      uploadUrl:"http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传请求头
      headerObj:{
        Authorization:window.sessionStorage.getItem('token'),
      },
      activeName:'0' ,
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 分类数组
        goods_cat:[],
        // 图片数组
        pics:[],
        // 商品详情
        goods_introduce:'',
        attrs:[],
      },
      PreViewVisible:false,
      previewPath:'',
      // 选择分类列表
      CateList:[],
      // 动态参数列表
      manyTabData:[],
      // 静态属性列表
      onlyTabData:[],
      // 校验规则
      addrules:{
        goods_name:[
          { required:true,message:"请输入商品名称",trigger:"blur" },
        ],
        goods_price:[
          { required:true,message:"请输入商品价格",trigger:"blur" },
        ],
        goods_weight:[
          { required:true,message:"请输入商品重量",trigger:"blur" },
        ],
        goods_number:[
          { required:true,message:"请输入商品数量",trigger:"blur" },
        ],
        goods_cat:[
           { required:true, message:"请选择商品分类",trigger:"blur" },
        ]
      }
    };
  },
  created(){
    this.getCateList();
  },
  computed:{
    cateId(){
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  },
  methods:{
    /**
     * @name add
     * @desc 提交添加商品
     */
     add(){
      this.$refs.addruleForm.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必填项");
        }
        // lodash cloneDeep(obj) 深拷贝
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(',');
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo ={  
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo);
        })
        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id:  item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        // 发起请求
        const {data:res} = await this.$http.post('goods',form);
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg);
        }
        this.$message.success('添加商品成功!');
        this.$router.push('/goods')
      })
    },
    /**
     * @name getCateList
     * @desc 获取所有分类
     */
    async getCateList(){
      const {data:res} = await this.$http.get('categories');
      // console.log(res);
      if(res.meta.status !== 200){
        return this.$message.error("获取商品分类数据失败");
      }
      this.CateList = res.data;
    },
    // 级联选择器变化触发
    handleChange(){
      // console.log(this.addForm.goods_cate);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    // tab切换触发
    beforTablLeave(activeName,oldActiveName){      
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.warning("请选择商品分类");
        return false;
      }
    },
    /**
      @name tabClicked
      @desc tab栏被选中触发
     */
    async tabClicked(){
      // 访问的动态参数面板
      if (this.activeName === '1') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{sel: 'many'}}); 
        
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败");
        }
        // 赋值 
        this.manyTabData = res.data;
        // 将字符串分割为数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
        });
      }else if(this.activeName === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{sel: 'only'}}); 
        
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败');
        }
        this.onlyTabData = res.data;
      }
    },
    /**
     * @name handlePreview
     * @desc 处理图片预览
     */
    handlePreview(file){
      this.previewPath = file.response.data.url;
      this.PreViewVisible = true;
    },
    /**
     * @name handleRemove
     * @desc 处理移除图片的操作
     */
    handleRemove(file){
      const filePath = file.response.data.tmp_path;
      const i = this.addForm.pics.findIndex(x =>{
        x.pic === filePath;
      });
      this.addForm.pics.splice(i,1);
    },
    /**
     * @name handleSuccess
     * @desc 上传成功
     */
    handleSuccess(response){
      // 拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      this.addForm.pics.push(picInfo);
    }
  },
}
</script>
<style lang="less" scoped>
  .el-checkbox{
    margin: 0 10px 0 0 !important;
  }
  .previewImg{
    width: 100%
  }
  .btnAdd{
    margin-top: 15px
  }
</style>